12001021001221 has 4 divisors (see below), whose sum is σ = 13715452572832. Its totient is φ = 10286589429612.

The previous prime is 12001021001209. The next prime is 12001021001267. The reversal of 12001021001221 is 12210012010021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12001021001221 - 2¹⁹ = 12001020476933 is a prime.

It is a super-3 number, since 3×12001021001221³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001021001621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857215785795 + ... + 857215785808.

It is an arithmetic number, because the mean of its divisors is an integer number (3428863143208).

Almost surely, 2^{12001021001221} is an apocalyptic number.

It is an amenable number.

12001021001221 is a deficient number, since it is larger than the sum of its proper divisors (1714431571611).

12001021001221 is an equidigital number, since it uses as much as digits as its factorization.

12001021001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714431571610.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12001021001221 its reverse (12210012010021), we get a palindrome (24211033011242).

The spelling of 12001021001221 in words is "twelve trillion, one billion, twenty-one million, one thousand, two hundred twenty-one".